The ATEM inputs can be switched between MIC or LINE. But even set to LINE they are a little hot for my liking. I built a 2x TS to 1/8″ TRS cable with 10 dB of attenuation in each channel and that has worked fine. Adjust the ATEM input gain to get a good reading on its meters. The QU has peak reading meters, while the ATEM has peak hold meters, so they won’t look the same, but this should clean up the audio.
Geoff